Heat-regenerator for cement-kilns.



No. 813,630; PATENTED FEB. 27, 1906.

0. ELLIS.-

HEAT REGENERATOR FOR CEMENT KILNS. APPLICATION FILED APB..1B,1905.

"2 SHEETS-SHEET 1.

WITNESSES: m INVE'NTOR PATBNTED FEB. 27,1906.

c. ELLIS. HEAT .REGENERATQR FOR CEMENT KILNS.

APPLICATION FILED AP'B.18,1905.

2 SHEETS-SHEET 2.

WITNESSES:

zen of the United States, and a residentof New y UNITED STATES.-

" PATENT OFFICE.

.CARLETON ELLIS, OF NEW YORK, N. Y., A SSIGNOR TO COMBUSTION I UTILITIES COMPANY, OF

- 'NEW- YORK.

NEW YORK, N. Y., A CORPORATION OF Specification of Letters Patent.

Patented Feb. 27, 1906.

- Application filed April 18, 1905. SBfialNO- 266,246.

T at ivhomit may concern: Be it known that I, OARLETo ELLIS a citi York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Heat-Regenerators for Cement-Kilns, of which the following is a specification. a

This invention relates to apparatus for the regeneration or recuperation of a portion of the sensible heat which is nowlostat the stack in the manufacture of Portland-cement clinker by the rotary-kiln'process. As is well known, the gases leaving the upper part of the rotary kiln are at a high temperature and carry in the form of sensible: heat a very large 1portion of the total heat generated by the ins It isthe object of this invention to recover a large portion of the heat ordinarily-lost in this manner by means of regenerative devices, as are hereinafter shown.

.In the accompanying drawings, Figure 1 shows alongitudinal elevation of a rotary kiln and a section of a regenerating device, taken along the lines a a of Fig. 2. Fig. 2 is a plan view of the regenerators shown in section of Fig. 1 and is taken along the floor-line of- Fig. 1. Fig. 3 represents a modified form i of regenerator which may be attached to the s kiln shown in Fig. 1. Referring to Fig. 1, 1 is a rotary kiln hav- 1 I ing' the housing. 2 in its upper art, on which is situated the stack 3. 4 is a eader inclosing "the lower part of the kiln and is provided v3.5

with apertures for the introduction of-fuel and for the discharge of the burned clinker.

The kiln rests on the rollers 5 and is rotated 4 a form articularly adapted for the burning the hot pro by 'the mechanism 6. a 7 a fuel-feed pipe for the admission of powdered coal, oil, 'or gas used in burning the cement. It is shown in 'of pow ered coal, this fuel being admitted at Sand air being'admitted through the pipe 9. "10 is a heatregenerative system havin two sets of chambers or parts symmetrical? in t e lower (part of'the housing 2, by whic into the chamber 12. 7 13 is a damper which may be raised to permit the products of combustion to pass through the chamber'14. At are shownribs of refractory material form-.

I sages and walls.

y arran ed, as shown-in Fig. 2. 11 is an openin nets ofcombustionmay enter.

ing comparatively narrow heat-retaining pas- 16 is a comparatively large dust-chamber having the baflie 17 extending vertically to its upper part. a door and passage 18 are provided for the removal of dust. At 19 are shown additional In the lowerpart ribs; at 20 a second-dust-c'hamber having i the bafiie 21 and the means for dust removal 22. Similarly, 23 representsa third set of ribs or flues; 24, another settling-chamber; 25, a bafile, and 26 a cleaning-'outopening.

A dam er 27. allows assage of the products of com ustion into t e chamber 28. 29 is a passage or ipe extending from said chamber to the stack 3. 30 is a damper laced-below the entrance of passage29 int'o t e stack. By adjusting this damper products of combustion may be sent downwardly into the regen-c erators and finally through 29 into the stack above the dam er. 31 is an air-inlet into the chamber 14, w 'ch may be closed by the plug 32. such a manner that the closure of the opening 32 causes the damper 13 to rise, thereby form- It is arranged .on the mechanism 33 inv mg apassage between the chambers 12 and 14.

In the chamber 24 is situated an air-outlet 34, from which extends the pipe or passage 35 to the fan 36. A damper 42. is placed in this passage. The fan exhausts'i'nto the pipe 9, 38 is a conin which is placed a damper 37. duit or passage extending from the chimneyflue 29 to the passage 35, allowing of theuse ofproducts of combustion,if desired. 39 is a gate controlling thissup. ly. The damper 27 is operated by the 111cc anis'm'40. All the dampers and gates in uestion may be so connected and arrangedt at they may be .operated from the lowerpart of the kiln by means of levers or other operating devices.

r'egenerators' is shown. 11 is the opening 'In Fig. 2 the symmetric arrangement of the i from thehousing 2' (shown in Fig. 1) into the chamber 12. 13' and 13 are the vertical dampers above mentioned. 23'- are the horizontal ribs or passages of refractory material used as heat-retaining walls.

16 16' 20 20 24 24' are the'dustchambers aforesaid.

chimney-flue inlet.

17 17' 2'1 21' 2525' are dust-baflles. 27 and 27 are dampers; 29, the

31 and 31 are cold-air inlets; 34 and 34', hot-air outlets. 41 and 41 are pits fgr removal of the dust.

into the flues 6 and 6' in to the stack 7.

5 and 5 are dampers similar in nature to those shown at 3 and 3, which serve to regulate the fiow of the heated gases. Between the passages 2 and 4 and 2 and 4 is a passage 8 and 8, having thin walls. Cold-air inlets are shown at 9 and 9 and heateda-ir-outlets at 10 and 10. Acollecting-pipe for the heated air is shown at 11.

In the operation of the apparatus illustrated in Fig. 1 powdered coal or other fuel is fed into the feedipe 7 and is burned in the kiln 1. The pro nets of combustion ass into the housing 2. At that point by t he regulation of the dam er they may eitherpass up the stack in w ole or in part or may 1n whole or in part pass downwardly into the regenerator 10 or 10 Ordinarily such portion of the products of combustion as is needed to highly heat the regenerator is passed into one set of regenerators. Suppose, for instance, that products of combustion are being conducted into the regenerator 10. This will necessi-- tate opening the damper 13, thereby closing I The products of combus-.

the air-inlet 31.

I tion will pass in contact with the refractory surfaces 15, 19, and 23 and through the dustchambers 18, 20, and 24 and on leaving the last dust-chamber will pass through the opening produced by raising damper 27 into the chamber 28 and from thence by means of stack-passage 29 into the stack 3. In the opposite set of regenerators by reference to Fig. 2 it will be evident that for the passage of air therethrough the damper.13 should be closed and the air-inlet 31 opened.

The damper 42 is closed,while a corresplond-v ing damper on the opposite side (not s own in the drawings but situated on the rising part of pipe 34) is o ened. The fan-blower 36 causes a current 0 air to pass through that regenerator which has been previously heated by the passage therethrough of products of combustion in the manner described in the .case of the operation of the regenerator 10.

' When the regenerator 10- has'become cooled to such an extent that the air assing there through is no longer sufficientl y operation may be reversed, causing thefiow of products of combustion through this regenerator and causing the air to flow through re enerator 10.

t is not necessar to have the fan-blower 36 situated so that t eair is induced through" 2 and 2' are fines ex-1 heated, the

plates.

the regenerators. It may be placed at the o posite end of the regeneratorand forced t on I the passage 31. Any other form'of a mec anical blast appliance or draftproducing means may be employed. The arrangement of the refractory walls and surfaces in the regenerators may be varied according to conditions. A vertical arrangement of the refractory surfaces or. ribs may in some cases be better, owing to the fact that such a construction facilitates the removal of dust.

The regenerator illustrated in Fig. 3 may be operated as follows: Products of combustion are passed downwardly through the aperture 1 into the passage 2. The damper 3 being raised, the heated gases pass around the walls of the flue 8 into the flue 7 and from thence by 0 ening the damper 5 into the passage 6 to t e stack 7. Simultaneously the damper 3' is closed while the air-inlet 9 is open and air is drawn or forced through the regenerative or heating flues 2', 4, and 8 and from thence through the-outlet 10 into the passage 11.' It may be taken at that point to the kiln and used for accelerating or intensifying combustion. The fiues 8 and 8 may be of thin refractory material, or, if desired, they may be of metal.

I do not-limit myself to the constructiona features herewith shown, as various IIlOdlfications of my apparatus may be made without departing from the scope of this invention.

I What I claim is- 1. A cement-making apparatus comprising a kiln and a regenerative air-heater therefor abstractin waste gases from the kiln and provided wit a succession of alternating constricted and expanded passages, the latter passagesbeing provided with dust-re-' for abstracting waste ases from said kiln and provided with a lura ity of successive re enerative devices a ternating with dust sett ing and collecting chambers containing ba'flie- 5. A cement-making ap aratus comprismg a kiln, a housmg for t e gasexit end thereof, a chimney stack connected to the housing, a regenerative air-heater also con- 'nected to the housing at a point remote from the main draft therethrough and abstracting a portion of the waste gases from said housing and means for collecting and settling dust. in said'regenerative air-heater.

6. In a cement-making ap aratus, the combination of a kiln, air-feeding means, fuelfeeding means, a regenerative air-heater heated by waste gases from the kiln and means for withdrawing a portion of said gases after passing through the heater and adding said portion to the heated air.

7. A cement-making apparatus compris-v ing a kiln and a regenerative air-heater therefor, said heater containing a series of tiers of heat absorbing bodies arranged with passages therebetween and said tiers being spaced apart to form dust-settling chambers.

8. A cement-making apparatus comprising a kiln and a regenerative air-heater therefor, said heater containing a series of tiers of heat absorbing bodies arranged with pase sages therebetween, said tiers being spaced apart to form dust-settling chambers, and

baffle-plates in said chambers.

Signed at New York city, in the county of New York and State of New York, this 17th day of April, A. D. 1905.

. CARLETON ELLIS. Witnesses:

WARREN E. DIXON,

A. M. SENIOR. 

